Compact flat subtractor / Double Differential - tank steering build

This is a type of steering for a tracked vehicle that uses so-called subtractor which means input from motor used for steering is subtracted from the main drive input. If you want to learn more about this, check out Sariel's video here:    • What's a LEGO SUBTRACTOR and how to build ...   Music: Peaceful Mind by Astron from Youtube Audio Library Timestamps: 00:00​ Build at 2x speed 03:20​ Manual showcase 04:47 Powered showcase 06:05 Drive showcase